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IBM System/360 Field Engineering Manual

IBM System/360
131 pages
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Page #117 background image
Control
Unit
Response
to
Select-Out
(Continued)
The channel
acknowledges
the
control-unit-busy
sequence
The fall
of
status-in
completes
the
control-unit
por:tion
of
this
sequence
Th&
control
~itiontQ
cl
ear,
a need
for
service,
or
another
selection
sequence
The byte on bus
out need not
be
valid
ofter
the
fall
of
the
in
tag
The fall
of
address out
completes this signal
sequence.
The byte
on
bus
No
out
must
hove
been
valid
for
at
least 100
ns
prior
to
the
raising
of
the
out
tog
The
fall
of
releot
In
completes
this
signal
equence.
The channel now
awaits
a request for polling or
a new command
c_______
he
channel
now
awaih
NOTE:
All
mention
of
select
out
assumes
proper operation
of
hold out as well.
Thus,
select
out
up
means
select
out
and hold out up,
and
select out
down
means either select out or hold out
d~n
118
S/360
a request for polling or
a
new
command
Y Suppress
out
is
normcilly
dropped at the start of
on
interface
sequence
if
it
was up for the purpose
of
indicating
chaining
The byte on bus in must
be
valid
within
100
ns
after
the
raising
of
the
in
tag
IBM
CONFIDENTIAL

Table of Contents

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IBM System/360 Specifications

General IconGeneral
BrandIBM
ModelSystem/360
CategoryDesktop
LanguageEnglish

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